So my fiance comes from a divorced family. His parents divorced when he was 4 and his father is remarried and has been for about 25 years. His mother never did and has been the source of some tension ever since we’ve been together. The thing is I don’t know exactly why. He is the youngest of 4 siblings, two of which where living on their own when their parents divorced and left my fiance and an older sister to continue living with their mother. There is absolutely no amicability between the parents. Not even for the sake of their kids. I’ve heard stories from his dad and step mother about how his mom had accused one of the sisters, who was 14 at the time, of having an affair with the mom’s current boyfriend. Another one of the mom trying to get the other sister’s children taken away by child protective services without any grounds to do so. There is a major separation between the other siblings and the mom and my fiance is really the only one she clings to. He grew up around passive aggressive behavior and it is so ingrained in him he’s not even aware that he’s doing it. He also gets extremely stand-offish and defensive whenever she’s involved. Like, even if he’s just on the phone with her he gets so tense and argumentative with me. I’m trying to find out what the root of the problem is but I can’t talk to him about it without him getting extremely upset. Any advice?